Forge furnace



FORGE FURNACE l Filed June 17, '1937 2 Sheets-Sheet 1 i-J- J0 I (15 M? i 'Inverztons;

James W Vanderfioal fiaymaiad if 1 31517615 i Atty)".

Patented Dot. 4, 1 938 SIPATENT' oFFiCE FORGE FURNACE F- 1 James W. Vanderpool, Dedham, and Raymond E.

- Fiscus, Malden, Mass., assignors to Eastern Biefractories Company, Inc., Boston, Mass., a notation of Massachusetts cor- Ap'plicationJnne 17, 1937, Serial No. 148,715

' 53 Claims. (01. 263-43) This invention relates to an improvement in a forge furnace adapted to heat, reheat or temper iron, steel or any of thecompounds or mixtures of metal containing iron as a base metal or as 5 an alloy as well as any non-ferrous metals which might be sotreated. I

The primary object of this invention is to provide a forge furnace so constructed that the metal is heated at or near the hearth and wholly within 10 the furnace, and that any pieces of metal which inadvertently get into the'furnace can easily be recovered.

Further objects of the invention are to provide a furnace wherein only the coldest gases are ex- 15 hausted,'the hottest gases are brought 'in contact Fig. 2 is a sectional plan view of such furnace taken through the metal loading door:

Fig. 3 is a transverse sectional view taken along the line 3-3 in Fig.,, 2; I Fig. 4 is a longitudinal sectional view. taken along the line 4-4 in Fig. 3; and I Fig. 5 is a longitudinal sectional view taken 35 along the line 5 in Fig. 2.

The furnace i is supported in the usual manner by-a frame ll here shown as comprising a plurality of posts l and connecting cross barsJB formedof angle bars and a platform il. 40 furnace l0 comprises a combustion chamber 20 and a stack 2|. The chamber 20 includes a hearth 22 on whichthe metal is heated and has a lining 23 of suitable refractory-material. 1

The fuel, oil; gas or the like, is fed'into the 45 chamber 20 from tuyeres (not shown) through in-" rows 29 .in Fig.4, from the top of the chamber downwardly along the front wall thereof, and rearwardly over the hearth 22 and upwardly along the rear wall.

The sides and bottom of the furnace have an outer casing 30 of sheet metal and between the casing and the lining is'an intermediate layer 3| 40 extending across theframe.

of insulating material. The arch of the furnace is preferably made removable, anchors 36 being inserted in the lining. The heads of the anchors 36 receive I beams 31 extending across, and supported by, the frame II and the arch is thus firmly held in position. The lining above the loading inlet 28 is also reinforced by anchors 38 carried by posts 39 supported upon angle beams Additional anchors 4| carried by the casing 30 at the front and rear walls reinforce the lining at other points as shown in Fig. 5. When conditions require access to the chamber 20 as for repairs to the lining 23 or hearth 22, the arch 35 can easily be lifted by a crane or other hoisting ap aratus attached to. the I-beams 31, the layer 3i of insulation which forms the top of the furnace being cut to permit removing the arch. Access to the chamber is thus afforded and the necessary work can easily be done.

The fiues 21 are controlled by a'damper 4B adjustably located at the base of the stack and metal loading inlet 28. Thus there is no danger that these gases will flow out of the chamber through the inlet 28, and hence no air curtain or other protecting barrier need be provided as is The- ' let passages 25 and the used combustion'gases pass from the chamber 20 through exhaust outlets 26 and flues 21 to the stack 2|. The metal is placed on the hearth 22 through the loading inlet 28.

on the down draft principle, the combustion gases entering nearthe top of the chamber and leaving at the bottomthereof. The inner face ofthe lining 23 is so formed that the gases are'iorced to follow the swirling path, indicated by the ar- As shown in the drawings, the furnace is built set forth in the following claims.

usual in most forge furnaces.

It will be noted that as the gases travel in the chamber, the gases which are hottest pass over the hearth 22 and heat the metal placed thereon. Sincesuch gases have given up heat to'the metal, they are now cold and-drop out of the chamber through the outlets 26- at the rear end of the hearth. The remaining gases rise to the top of the chamber where they mingle with the fresh gases entering the inlets 20 and the cycle is I claim:

1. A down draft forge furnace comprising a combustion chamber and a stack, said chamber having openings in a wall thereof near the top through which combustion gases are forced under pressure, and a loading opening in anopposite wall thereof near the bottom through which metal to be heated is introduced into the chamher, a hearth at the bottom of the chamber onto which the metal is fed through said last named openings, a plurality of openings in the bottom of the chamber adjacent the hearth, and lining material on the walls of the chamber so shaped at its inner surface that the gases entering the chamber are caused to travel downwardly past the loading opening to the hearth, thence over the hearth and in part upwardly, the remainder I passing out of the chamber through the openings adjacent the hearth, and fines connecting said last named openings to said stack.

2. A down draft forge furnace comprising a combustion chamber and a stack, said chamber having openings in a wall thereof near the top through which combustiongases are forced under pressure, and a loading opening in an opposite wall thereof near the bottom through which metal to be heated is introduced into the chamber, a hearth at the bottom of the chamber onto which the metal is fed through said last named opening,

a plurality of openings in the bottom of the chamber adjacent the hearth and lining material on the walls of the chamber so shaped at its inner surface that the gases entering the chamber are caused to travel downwardly past the loading opening to the hearth, thence over the hearth and in part upwardly, the remainder passing out of the chamber through the openings adjacent the hearth, flues connecting said last named openings to said stack and a damper for controlling the passage of the gases through the flues to the stack.

3. A down draft forge furnace comprising a combustion chamber and a stack, said chamber having openings in a wall thereof near the top through which hot combustion gases are forced under pressure, and a loading opening in an opposite wall thereof near the bottom through which metal to be heated is introduced into the chamber, a hearth at the bottom of the chamber onto which the metal is fed through said lastnamed openings, a plurality of openings in the bottom of the chamber adjacent the hearth, and lining material on the walls of the chamber so shaped at its inner surface that the gases entering the chamber are caused to travel downwardly past the loading opening to the hearth, and

thence over the hearth toward the first-men-' tioned wall, the cooler portion of the gases passing out of the chamber throughthe openings adjacent the hearth, and the remainder of the gases rising to Join the gases forced into the chamber, and fines connecting the openings adjacent the hearth to the stack whereby the cooler portion of the gases escape from the furnace.

JAMES W. VANDERPOOL RAYMOND E. FISCUS. 

